JP7021602B2 - Rotating machine - Google Patents

Description

The present disclosure relates to a rotary electric machine.

Conventionally, a rotary electric machine having a stator core in which a plurality of steel plates are laminated has been used. In such a rotary electric machine, the stator core and the housing may be fixed in the stacking direction by using bolts. At the time of fixing, the stator core is compressed in the stacking direction by the axial force of the bolt, and the length in the stacking direction is shortened. At this time, due to the fact that the stator core has a laminated structure and the Young's modulus is not uniform, the amount of change in length along the stacking direction of the stator core may vary. In the rotary electric machine described in Patent Document 1, a plate that abuts on the inner peripheral surface of the housing is arranged on the end surface of the stator core and fixed by bolts, so that the stator core and the housing are fastened and inserted on the tip side in the bolt insertion direction. The stator core is fixed to the housing by a plate on the rear end side in the direction. As a result, the movement and deformation of the stator core due to vibration during driving of the rotary electric machine are suppressed while suppressing the influence of the variation in the amount of change in the length along the stacking direction.

Japanese Patent No. 4811114

In the rotary electric machine described in Patent Document 1, since the stator core is fixed to the housing by the contact of the plate on the rear end side in the insertion direction, the binding force by the bolt is limited to the contact direction. Therefore, there is a problem that the movement and deformation of the stator core due to the vibration during driving of the rotary electric machine are not sufficiently suppressed. Therefore, there has been a demand for a technique capable of further suppressing the movement and deformation of the stator core.

The present disclosure has been made to solve at least a part of the above-mentioned problems, and can be realized as the following forms.

According to one embodiment of the present disclosure, a rotary electric machine (10, 10a, 10b) is provided. This rotary electric machine is composed of a rotor (40) and a plurality of steel plates laminated along the axial direction (AD), and has a cylindrical stator core in which a first through hole (33) is formed along the axial direction. A stator (30) having (31); a housing (20, 20b) for accommodating the rotor and the stator; and a fixing member (50, 50a, 50b) for fixing the stator core to the housing; The fixing member is arranged in contact with the axial end surface (34) of the stator core, and a fixing plate having a second through hole (66) and a third through hole (68) along the axial direction is formed. (60, 60a, 60b); A first fastening member that is arranged so as to penetrate the first through hole and the second through hole in the axial direction and fastens the stator core and the housing in the axial direction. (70) and; a cylindrical tubular member (80) inserted into the third through hole and having its own end face (81) in the axial direction in contact with the housing; the third via the tubular member. It has a second fastening member (90) that is inserted into the through hole and fastens the fixing plate and the housing in the axial direction; the fixing plate is along the axial direction with respect to the cylindrical member. It is configured to be movable.

According to the rotary electric machine of this form, since the fixed plate is configured to be movable along the axial direction with respect to the tubular member, the stator core composed of a plurality of steel plates laminated along the axial direction of the stator core. It is possible to suppress the influence of variation in the amount of change in length along the axial direction. Further, since the stator core can be fixed to the housing by the fixing member having the fixing plate, the first fastening member, the tubular member, and the second fastening member, it is possible to suppress the movement of the stator core due to the vibration during driving of the rotary electric machine. It is possible to suppress the deformation of the stator core. Further, since the second fastening member is inserted into the second through hole 66 via the tubular member, the fixing plate and the stator core can be restrained in the circumferential direction and the radial direction of the tubular member. Therefore, it is possible to suppress a decrease in the fixing strength of the stator core as compared with a configuration in which the tubular member and the second fastening member are omitted and the fixing plate is brought into contact with the inner peripheral surface of the housing and restrained only in the contact direction. , The movement and deformation of the stator core can be further suppressed.

The present disclosure can also be realized in various forms. For example, it can be realized in the form of a method for manufacturing an electric machine, a rotary electric machine, a method for fixing a stator core, and the like.

It is a perspective view which shows the schematic structure of the rotary electric machine as one Embodiment of this invention. It is the A arrow view of FIG. It is sectional drawing which shows the cross section along the 3-3 line of FIG. It is sectional drawing which shows the cross section along the 4-4 line of FIG. It is an exploded perspective view which shows by disassembling a rotary electric machine. It is an enlarged perspective view which shows the fixing member in an enlarged manner. It is a top view which shows the schematic structure of the rotary electric machine of 2nd Embodiment. It is an exploded perspective view which shows by disassembling the rotary electric machine of 2nd Embodiment. It is a top view which shows the schematic structure of the rotary electric machine of 3rd Embodiment. It is a perspective view which shows the rotary electric machine of 3rd Embodiment. It is an exploded perspective view which shows by disassembling the rotary electric machine of 3rd Embodiment.

A. First Embodiment:
A-1. Device configuration:
The rotary electric machine 10 shown in FIGS. 1 to 6 is configured as a so-called inner rotor type permanent magnet synchronous motor, and is mounted on a vehicle (not shown). In FIGS. 1, 2, 4 and 5, the cover 28 and the rotor 40, which will be described later, are not shown. The rotary electric machine 10 includes a housing 20, a stator 30, a rotor 40, and four fixing members 50. The housing 20, the stator 30, and the rotor 40 have their axial ADs coincide with each other. The axial direction AD is a direction parallel to the axial line AX of the rotary electric machine 10. In the following description, the axial direction AD is also referred to as a stacking direction.

The housing 20 has a bottomed, substantially cylindrical appearance shape, and houses the stator 30 and the rotor 40 inside. As shown in FIG. 3, the housing 20 has a side surface portion 21 and a bottom portion 26. The side surface portion 21 has a substantially cylindrical appearance shape. As shown in FIGS. 3 and 5, four recesses 22 arranged at equal intervals along the circumferential direction are formed on the inner peripheral surface of the side surface portion 21. Each recess 22 has a shape recessed in the radial direction and is formed along the axial direction AD. As will be described later, each concave portion 22 accommodates each convex portion 32 of the stator core 31. A first fastening portion 23 is formed on the end surface of each recess 22 on the bottom 26 side. The first fastening portion 23 is configured as a female screw and is fastened to the tip portion 72 of the first fastening member 70, which will be described later. Four fixed plate accommodating portions 24 are formed on the side opposite to the bottom 26 side in the axial direction AD from each recess 22. Each fixed plate accommodating portion 24 is connected to each recess 22 so as to correspond to each other, and is formed so as to be arranged at equal intervals along the circumferential direction. A fixed plate 60, which will be described later, is arranged in the fixed plate accommodating portion 24. A second fastening portion 25 is formed on each end face 201 of the axial direction AD in the fixed plate accommodating portion 24. The second fastening portion 25 is configured as a female screw and is fastened to the tip portion 92 of the second fastening member 90, which will be described later. The bottom portion 26 has a substantially disk-shaped external shape. An opening 27 is formed substantially in the center of the bottom portion 26. One end of the rotating shaft 45 of the rotor 40 is inserted into the opening 27 via the bearing 48. The side of the housing 20 opposite to the bottom 26 side in the axial direction AD is closed by the cover 28. The cover 28 has a substantially disk-like external shape. An opening 29 is formed substantially in the center of the cover 28. The other end of the rotating shaft 45 of the rotor 40 is inserted into the opening 29 via the bearing 49.

The stator 30 has a substantially cylindrical appearance shape. A rotor 40 is arranged inside the stator 30 in the radial direction. The stator 30 has a stator core 31 and a stator coil 38. The stator core 31 has a substantially cylindrical appearance shape, and is composed of a plurality of steel plates laminated along the axial direction AD. On the outer peripheral surface of the stator core 31, four convex portions 32 arranged at equal intervals along the circumferential direction are formed. Each convex portion 32 has a shape protruding outward in the radial direction, and is formed along the axial direction AD. Each convex portion 32 is housed in each concave portion 22 of the housing 20. Each convex portion 32 is formed with a first through hole 33 penetrating in the axial direction AD. The shaft portion 71 of the first fastening member 70 is inserted into the first through hole 33. A fixing plate 60 is arranged in contact with one end surface 34 of each convex portion 32 in the axial direction AD. A plurality of slots 37 arranged at equal intervals along the circumferential direction are formed on the inner surface of the stator core 31 in the radial direction. A stator coil 38 is wound around the slot 37. The stator coil 38 is composed of a three-phase coil composed of a U phase, a V phase, and a W phase.

As shown in FIG. 3, the rotor 40 has a substantially columnar appearance shape. The rotor 40 is arranged inside the stator 30 in the radial direction via the gap G1. The rotor 40 has a rotor core 41 and a rotating shaft 45. The rotor core 41 has a substantially cylindrical appearance shape, and is composed of a plurality of steel plates laminated along the axial direction AD. A plurality of permanent magnets (not shown) are embedded in the rotor core 41 on the side facing the stator core 31. The rotating shaft 45 has a rod-shaped appearance and is fixed to the inside of the rotor core 41 in the radial direction. One end of the rotary shaft 45 is inserted into the opening 27 via the bearing 48 and rotatably fixed, and the other end of the rotary shaft 45 is inserted into the opening 29 via the bearing 49 and rotatably fixed. ..

The four fixing members 50 each fix the stator core 31 to the housing 20. As shown in FIG. 2, the four fixing members 50 are arranged side by side at equal intervals along the circumferential direction. As shown in FIG. 6, the fixing member 50 includes a fixing plate 60, a first fastening member 70, two cylindrical members 80, and two second fastening members 90.

Each fixing plate 60 has a substantially rectangular plate-like appearance shape, and is arranged in each fixing plate accommodating portion 24 as shown in FIG. Each fixing plate 60 is arranged in contact with the end surface 34 of each convex portion 32 formed on the stator core 31. As shown in FIG. 6, in the following description, the surface of the fixed plate 60 on the side that abuts on the end surface 34 is also referred to as an abutting surface 61, and the surface on the side opposite to the abutting surface 61 is also referred to as a non-contact surface 62. Call. Each fixed plate 60 is formed with a second through hole 66 and two third through holes 68 along the axial direction AD, which are circular in cross section. The second through hole 66 is formed substantially in the center of the fixing plate 60 in the longitudinal direction. The first fastening member 70 is inserted into the second through hole 66. The two third through holes 68 are formed at positions sandwiching the second through holes 66 along the circumferential direction. The position of the axial center of each third through hole 68 is located radially outside the stator core 31 with respect to the position of the axial center of the second through hole 66. The second fastening member 90 is inserted into each third through hole 68 via the tubular member 80. The fixing plate 60 is configured to be movable along the axial direction AD with respect to the tubular member 80. In this embodiment, the fixing plate 60 is made of titanium.

The first fastening member 70 fastens the stator core 31 and the housing 20 in the axial direction AD. As shown in FIG. 3, the first fastening member 70 is arranged so as to penetrate the first through hole 33 of the stator core 31 and the second through hole 66 of the fixing plate 60 in line with the axial direction AD. The first fastening member 70 is composed of bolts and has a shaft portion 71 and a head portion 75. The shaft portion 71 has a rod-like appearance shape and is inserted into the first through hole 33 and the second through hole 66. The shaft portion 71 has a tip portion 72 on which a male screw is formed on the side opposite to the head portion 75. The tip portion 72 is inserted into and screwed into the first fastening portion 23 of the housing 20. The head portion 75 has a circular plan view shape having a diameter larger than that of the second through hole 66. Therefore, the head portion 75 and the non-contact surface 62 of the fixed plate 60 are in contact with each other. A hexagonal hole used for tightening the first fastening member 70 is formed in the radial center of the head portion 75. The shape of the head 75 may be formed into a hexagon or the like by omitting the hexagonal hole.

The two tubular members 80 each have a cylindrical appearance shape. Each cylindrical member 80 is press-fitted into each third through hole 68, respectively. As shown in FIGS. 3 and 4, the end face 81 of the axial AD of the tubular member 80 is in contact with the end face 201 of the axial AD of the housing 20 at the fixed plate accommodating portion 24 of the housing 20. Each second fastening member 90 is inserted into each tubular member 80. As shown in FIGS. 4 and 6, in the present embodiment, the length a of the tubular member 80 is configured to be larger than the thickness b of the fixed plate 60 in the axial direction AD. Further, in the present embodiment, the tubular member 80 is made of stainless steel.

The two second fastening members 90 fasten the fixing plate 60 and the housing 20 in the axial direction AD, respectively. Each of the second fastening members 90 is inserted into the third through hole 68 via the tubular member 80. The second fastening member 90 is composed of bolts and has a shaft portion 91 and a head portion 95. The shaft portion 91 has a rod-shaped appearance and is inserted into the third through hole 68 via the tubular member 80. The shaft portion 91 has a tip portion 92 on which a male screw is formed on the side opposite to the head portion 95. The tip portion 92 is inserted into and screwed into the second fastening portion 25 of the housing 20. The head portion 95 is formed in a circular shape, and the end surface of the head portion 95 and the end surface of the tubular member 80 in the axial direction AD are in contact with each other. A hexagonal hole used for tightening the second fastening member 90 is formed in the radial center of the head 95. The shape of the head 95 may be formed into a hexagon or the like by omitting the hexagonal hole.

In the assembly of the rotary electric machine 10 having the above configuration, when the stator core 31 is fixed to the housing 20 by using the first fastening member 70, the axial force of the first fastening member 70 is generated. The stator core 31 having a laminated structure is compressed in the laminated direction, that is, in the axial direction AD by the axial force of the first fastening member 70. Therefore, the length of the axial AD of the stator core 31 is shortened. Here, since the Young's modulus of the axial AD of the stator core 31 having a laminated structure is not uniform, the amount of change in the length of the stator core 31 along the axial AD may vary. Further, since the Young's modulus of the axial direction AD of the stator core 31 is low, the amount of change in length along the axial direction AD is large. Therefore, the variation in the amount of change in the length of the stator core 31 along the axial direction AD can be large.

In the rotary electric machine 10 of the present embodiment, by fixing the stator core 31 and the housing 20 with the fixing member 50, the rotary electric machine 10 suppresses the influence of the variation in the amount of change in the length along the axial direction AD of the stator core 31. The movement and deformation of the stator core 31 due to the vibration during driving of the 10 are suppressed. More specifically, since the fixed plate 60 and the tubular member 80 are composed of separate members, the fixed plate 60 is configured to be movable along the axial direction AD with respect to the tubular member 80. Therefore, as described below, the influence of the variation in the amount of change in the length of the stator core 31 along the axial direction AD is suppressed.

The first fastening member 70 penetrates the first through hole 33 of the stator core 31 and the second through hole 66 of the fixing plate 60 together, and fastens the stator core 31 and the housing 20 in the axial direction AD. Further, the second fastening member 90 is inserted into the third through hole 68 of the fixing plate 60 via the tubular member 80 whose length a along the axial direction AD is larger than the thickness b of the fixing plate 60. There is. Therefore, as shown in FIG. 4, the contact surface 61 of the fixed plate 60 is in contact with the end surface 34 of the convex portion 32 of the stator core 31, but is not in contact with the end surface 201 of the fixed plate accommodating portion 24 of the housing 20. In this way, the second fastening member 90 fastens the fixing plate 60 and the housing 20 in the axial direction AD with the gap G2 provided between the contact surface 61 of the fixing plate 60 and the end surface 201 of the housing 20. is doing.

When the length of the stator core 31 along the axial direction AD is relatively small, the gap G2 is smaller than in the state shown in FIG. 4, and when the length of the stator core 31 along the axial direction AD is relatively large, the gap G2 is smaller. , The gap G2 becomes larger than the state shown in FIG. On the other hand, the tubular member 80 is fixed to the housing 20 by the second fastening member 90. Therefore, the fixing plate 60 is fastened to the housing 20 in a state of being movable along the axial direction AD. With such a fixing mode, even if the amount of change in the length of the stator core 31 along the axial direction AD varies, the influence of such variation can be suppressed and the stator core 31 can be firmly fixed to the housing 20.

According to the rotary electric machine 10 of the first embodiment described above, since the fixing plate 60 is configured to be movable along the axial direction AD with respect to the tubular member 80, it is aligned with the axial direction AD of the stator core 31. The effect of variation in the amount of change in length can be suppressed. Further, on the side where the cover 28 is arranged, the stator core 31 can be fixed to the housing 20 by the fixing member 50. Further, on the bottom 26 side, the stator core 31 can be fixed to the housing 20 by the first fastening member 70. Therefore, the stator core 31 can be fixed to the housing 20 on both end faces of the axial direction AD of the stator core 31. Therefore, it is possible to suppress the movement of the stator core 31 in the radial direction due to the vibration during driving of the rotary electric machine 10, and it is possible to suppress the deformation of the stator core 31. Further, it is possible to suppress the stator core 31 from moving in the circumferential direction and the axial direction AD.

Further, since the tubular member 80 has a cylindrical appearance shape and is inserted into the second through hole 66 of the fixing plate 60, the fixing plate 60 can be restrained in the circumferential direction and the radial direction of the tubular member 80. , The movement of the stator core 31 can be suppressed.

Here, in the configuration in which the tubular member 80 and the second fastening member 90 are omitted and the fixing plate is brought into contact with the inner peripheral surface of the housing, the first fastening member restrains the fixing plate only in the contact direction. The binding force is weak, and the movement and deformation of the stator core due to vibration during driving of the rotary electric machine cannot be sufficiently suppressed. Further, since point contact is made in the contact direction, wear is likely to occur between the first fastening member, the fixing plate, and the inner peripheral surface of the housing, the binding force is lowered due to aged deterioration, and the fixing strength of the stator core is lowered.

On the other hand, according to the rotary electric machine 10 of the present embodiment, since the fixed plate 60 can be restrained in the circumferential direction and the radial direction of the tubular member 80, the restraining force can be improved and the stator core due to the vibration at the time of driving the rotary electric machine 10 can be improved. The movement and deformation of 31 can be further suppressed.

Further, since it is possible to further suppress the movement of the stator core 31 in the radial direction, it is possible to prevent the gap G1 between the outer peripheral surface of the rotor core 41 and the inner peripheral surface of the stator core 31 from shrinking due to vibration during driving of the rotary electric machine 10. can. Therefore, it is possible to prevent the rotary electric machine 10 from failing due to contact between the outer peripheral surface of the rotor core 41 and the inner peripheral surface of the stator core 31. Therefore, since the gap G1 can be designed to be small in advance, the output of the rotary electric machine 10 as a motor can be increased, and the deterioration of the performance of the rotary electric machine 10 can be suppressed.

Further, since the stator core 31 is fixed to the housing 20 by the four fixing members 50 arranged side by side at equal intervals along the circumferential direction, it is possible to suppress a decrease in the fixing strength of the stator core 31 to the housing 20. Further, since the four fixing members 50 are arranged side by side along the circumferential direction of the stator core 31 so as to include the axis AX of the stator core 31, the fixing strength of the stator core 31 to the housing 20 is along the circumferential direction. It is possible to suppress unevenness and further suppress the radial movement of the stator core 31. Further, since each fixing member 50 has two tubular members 80 and a second fastening member 90 with respect to one first fastening member 70, the fixing plate 60 can be moved in the radial direction and the circumferential direction of the stator core 31. It can be suppressed, and the movement and deformation of the stator core 31 due to vibration during driving of the rotary electric machine 10 can be further suppressed. Further, since the second fastening member 90 is arranged at a position sandwiching the first fastening member 70 along the circumferential direction of the stator core 31, the movement of the fixing plate 60 can be further suppressed due to the vibration during driving of the rotary electric machine 10. The movement and deformation of the stator core 31 can be further suppressed. Further, since the four fixing plates 60 are provided, the shape of each fixing plate 60 can be simplified, and the manufacturing process of the fixing plate 60 can be suppressed from becoming complicated.

Further, in the fixing member 50 of the present embodiment, the fixing plate 60 is made of titanium and the tubular member 80 is made of stainless steel. In general, the coefficient of linear expansion of stainless steel is larger than the coefficient of linear expansion of titanium. Therefore, the increase rate of the length and the volume with the temperature rise is larger in the tubular member 80 than in the fixed plate 60. Therefore, the volume of the tubular member 80 increases more than that of the fixed plate 60 when the rotary electric machine 10 is driven, which is in a high temperature state, as compared with the case where the rotary electric machine 10 is in a normal temperature state. The binding force at the time of driving can be improved. Therefore, it is possible to further suppress the movement of the stator core 31 due to the vibration during driving of the rotary electric machine 10, and further suppress the deformation of the stator core 31. Further, since the binding force at the time of assembling can be lowered as compared with the time of driving the rotary electric machine 10, it is possible to suppress the deterioration of the assembling property of the rotary electric machine 10.

Further, since the length a of the axial direction AD of the tubular member 80 is larger than the thickness b of the fixed plate 60, the fixed plate 60 can be easily configured to be movable along the axial direction AD with respect to the tubular member 80. can. Further, since the length a of the axial direction AD of the tubular member 80 is larger than the thickness b of the fixed plate 60, the tubular member 80 covers the entire axial direction AD in the third through hole 68 of the fixed plate 60. Can be arranged, and it is possible to suppress a decrease in the binding force in a part of the axial direction AD. Further, since the tubular member 80 has a cylindrical appearance shape, the second fastening member 90 can be surrounded over the entire circumference, and the binding force is reduced in a part of the tubular member 80 in the circumferential direction. Can be suppressed.

B. Second embodiment:
The rotary electric machine 10a of the second embodiment shown in FIGS. 7 and 8 is different from the rotary electric machine 10 of the first embodiment in that the fixing member 50a is provided in place of the fixing member 50. The fixing member 50a is different from the fixing member 50 of the first embodiment in that the fixing plate 60a is provided instead of the fixing plate 60. Since other configurations are the same as those of the rotary electric machine 10 of the first embodiment, the same configurations are designated by the same reference numerals, and detailed description thereof will be omitted. In FIGS. 7 and 8, the rotor 40 and the cover 28 are omitted.

The fixing member 50a has one fixing plate 60a. The fixing plate 60a has a ring-shaped appearance and has four fixing portions 63a and four connecting portions 64a.

The four fixing portions 63a are arranged side by side at equal intervals along the circumferential direction. Each fixing portion 63a has the same configuration as the fixing plate 60 of the first embodiment, and one second through hole 66 and two third through holes 68 are formed. The four connecting portions 64a are connected to each fixed portion 63a along the circumferential direction, and connect the fixed portions 63a adjacent to each other in the circumferential direction. Therefore, the fixing member 50a of the second embodiment has a structure in which the four fixing plates 60 of the fixing member 50 of the first embodiment are connected to each other and integrated. As shown in FIG. 8, the contact surface 61 of the fixing plate 60a is located on the same plane as the fixing portion 63a and the connecting portion 64a. Further, the non-contact surface 62 of the fixing plate 60a is located on the same plane as the fixing portion 63a and the connecting portion 64a.

The rotary electric machine 10a of the second embodiment described above has the same effect as the rotary electric machine 10 of the first embodiment. In addition, since the fixing plate 60a has four fixing portions 63a arranged side by side along the circumferential direction and a connecting portion 64a connecting the fixing portions 63a adjacent to each other in the circumferential direction, the strength of the fixing member 50a is increased. Can be increased, and a decrease in the fixing strength of the stator core 31 can be further suppressed. Therefore, the movement and deformation of the stator core 31 can be further suppressed. Further, since the fixing plate 60a is composed of a single member having a ring-shaped appearance shape, the strength of the fixing member 50a can be further increased, and the decrease in the fixing strength of the stator core 31 can be further suppressed. Further, since the strength of the fixing member 50a can be increased, the strength of the housing 20 among the strengths of the rotary electric machine 10a can be reduced, and the thickness of the side surface portion 21 of the housing 20 can be reduced. Further, since the fixing plate 60a is composed of a single member, the number of parts can be reduced and the deterioration of the assembling property can be suppressed.

C. Third embodiment:
The rotary electric machine 10b of the third embodiment shown in FIGS. 9 to 11 is provided with a fixing member 50b instead of the fixing member 50 and a housing 20b instead of the housing 20. Different from 10. The fixing member 50b is different from the fixing member 50 of the first embodiment in that it has two fixing plates 60 and one fixing plate 60b. Since other configurations are the same as those of the rotary electric machine 10 of the first embodiment, the same configurations are designated by the same reference numerals, and detailed description thereof will be omitted. In FIGS. 9 to 11, for convenience of explanation, the external lead wire 99 is shown together with the rotary electric machine 10b, and the rotor 40 and the cover 28 are omitted.

The fixing member 50b has two fixing plates 60 and one fixing plate 60b. The two fixing plates 60 have the same configuration as the fixing plate 60 of the first embodiment. The fixing plate 60b has two fixing portions 63a and a connecting portion 64b. The two fixing portions 63a have the same configuration as the fixing portion 63a of the second embodiment. The connecting portion 64b is connected to each fixed portion 63a along the circumferential direction, and connects the fixed portions 63a to each other in the circumferential direction. The connecting portion 64b has an insulating portion 65b having an electrical insulating property.

The insulating portion 65b is formed on the non-contact surface 62 of the connecting portion 64b. The insulating portion 65b is formed in the connecting portion 64b at a substantially central portion in the circumferential direction. The insulating portion 65b is formed by covering the connecting portion 64b with a material having an electrically insulating property. In the present embodiment, the insulating portion 65b is made of a rubber material, but may be made of any material having electrical insulating properties such as a resin material instead of the rubber material. The insulating portion 65b is configured so that the leader wire 38b of the three-phase coil of the stator coil 38 wound around the stator core 31 can be fixed to each other. Each leader wire 38b is connected to the terminal of the external lead wire 99, respectively. The external lead wire 99 supplies electric power supplied from an external power cable (not shown) to the rotary electric machine 10b. That is, the insulating portion 65b functions as a terminal block for electrically connecting the external lead wire 99 and the stator coil 38.

The housing 20b is formed with a terminal accommodating portion 209b for accommodating the periphery of the terminal portion of the external lead wire 99 at a position corresponding to the external lead wire 99.

The rotary electric machine 10b of the third embodiment described above has the same effect as the rotary electric machine 10a of the second embodiment. In addition, the insulating portion 65b provided on the connecting portion 64b functions as a terminal block for electrically connecting the external lead wire 99 and the stator coil 38, so that the stator 30 vibrates when the rotary electric machine 10 is driven. The lead wire 99 and the leader wire 38b of the stator coil 38 can be connected. Therefore, as compared with the configuration in which the terminal block is provided in the housing and the external lead wire 99 and the leader wire are connected in the housing, it is possible to suppress an excessive load from being applied to the leader wire 38b due to the vibration of the stator 30. It is possible to prevent the leader line 38b from being cut.

D. Other embodiments:
(D1) In each embodiment, the first fastening member 70 is inserted into the first through hole 33 formed in the convex portion 32 of the stator core 31, but the convex portion 32 of the stator core 31 is omitted, for example, the stator core 31. A first through hole 33 may be formed in the peripheral edge portion on the outer side in the radial direction, and the first fastening member 70 may be inserted. Even with such a configuration, the same effect as that of the above embodiment can be obtained.

(D2) The configurations of the fixing members 50, 50a, and 50b in each embodiment are merely examples and can be changed in various ways. For example, in the rotary electric machine 10 of the first embodiment, four fixing members 50 are arranged side by side at equal intervals along the circumferential direction, but instead of four, two, three, six, etc. are arbitrary. The number of fixing members 50 may be arranged side by side along the circumferential direction, or may be arranged side by side at different intervals along the circumferential direction. Further, for example, the embodiment may include at least three fixing members 50 arranged side by side along the circumferential direction of the stator core 31 so as to include the axis AX of the stator core 31. According to this aspect, it is possible to prevent the fixing strength of the stator core 31 from the housings 20 and 20b from becoming uneven along the circumferential direction.

Further, for example, in the fixing member 50 of the first embodiment, each fixing member 50 has one first fastening member 70, but each fixing member 50 has two or more first fastening members 70. May be. Further, for example, in the fixing member 50 of the first embodiment, each fixing member 50 has two cylindrical members 80 and a second fastening member 90, but each fixing member 50 has three or more cylindrical members. The 80 and the second fastening member 90 may be provided, and each fixing member 50 may have one cylindrical member 80 and the second fastening member 90. That is, in general, the fixing member 50 may have at least one first fastening member 70, and two or more tubular members 80 and a second fastening member 90. Further, for example, the fixing plate 60 of the first embodiment has a substantially rectangular plate-like appearance shape, but may have any other shape, and the tubular member 80 and the second fastening may be obtained. It may have a shape according to the number and position of the members 90.

Further, for example, in the fixing plate 60a of the fixing member 50a of the second embodiment, all four fixing portions 63a are connected by the connecting portion 64a, but at least a part of the plurality of fixing portions 63a is connected. May be. Further, in the fixing plate 60b of the fixing member 50b of the third embodiment, the two fixing portions 63a are connected by the connecting portion 64b, but the three or more fixing portions 63a are connected by the connecting portion 64a or the connecting portion 64b. May be. That is, in general, in the fixing plate 60a, a second through hole 66 and a third through hole 68 are formed, and a plurality of fixing portions 63a arranged side by side in the circumferential direction and a plurality of fixing portions along the circumferential direction are fixed. It may have a connecting portion 64a which is connected to the portion 63a and connects the fixed portions 63a adjacent to each other in the circumferential direction.

Further, for example, in each embodiment, the fixing plates 60, 60a, and 60b are made of titanium, and the tubular member 80 is made of stainless steel, but each may be made of any metal material. For example, the fixing plates 60, 60a, 60b may be made of stainless steel, and the tubular member 80 may be made of aluminum. Further, the fixed plates 60, 60a, 60b and the tubular member 80 may be made of the same type of metal material, respectively, and the linear expansion coefficients of the fixed plates 60, 60a, 60b and the tubular member 80 are the same. May be. Further, the linear expansion coefficient of the fixed plates 60, 60a, 60b may be larger than the linear expansion coefficient of the tubular member 80. Even with such a configuration, the same effect as that of the above embodiment can be obtained.

Further, for example, in each embodiment, the first fastening member 70 and the second fastening member 90 are composed of bolts having shaft portions 71 and 91 and head portions 75 and 95, respectively. Not limited to. For example, it may be composed of so-called stud bolts and nuts, or may be composed of any other fastening member. Even with such a configuration, the same effect as that of the above embodiment can be obtained.

(D3) The configuration of the tubular member 80 in each embodiment is merely an example and can be variously changed. For example, the length a of the tubular member 80 may be smaller than the thickness b of the fixing plates 60, 60a, 60b. In such an embodiment, the outer diameter of the head portion 95 of the second fastening member 90 may be formed to be smaller than the diameter of the third through hole 68 formed in the fixing plates 60, 60a, 60b. Also in such an embodiment, the fixing plates 60, 60a, 60b can move along the axial direction AD with respect to the cylindrical member 80. Further, for example, the tubular member 80 may have a notch in a part in the circumferential direction. In such an embodiment, the circumferential orientation of the tubular member 80 may be different for each of the plurality of tubular members 80. Further, for example, a cylinder may be arranged with a slight gap between the tubular member 80 and the second fastening member 90 within a range in which the radial movement of the stator core 31 and the deformation of the stator core 31 can be suppressed. A slight gap may be provided between the shaped member 80 and the third through hole 68. Even with such a configuration, the same effect as that of the above embodiment can be obtained.

(D4) The rotary electric machines 10, 10a, and 10b of each embodiment are configured as an inner rotor type permanent magnet synchronous motor, but may be configured as any other synchronous motor or induction motor, and may be configured as an outer rotor. It may be configured as a type motor, and may be configured not only as an electric motor but also as a generator. Further, although the rotary electric machines 10, 10a and 10b of each embodiment are mounted on a vehicle, they may be mounted on an arbitrary moving body such as an airplane or a ship, not limited to the vehicle, and may be mounted on the moving body. Alternatively, it may be installed on a fixed object.

The present disclosure is not limited to each of the above-described embodiments, and can be realized with various configurations within a range not deviating from the gist thereof. For example, the technical features in each embodiment corresponding to the technical features in the embodiments described in the column of the outline of the invention may be used to solve some or all of the above-mentioned problems, or one of the above-mentioned effects. It is possible to replace or combine as appropriate to achieve the part or all. Further, if the technical feature is not described as essential in the present specification, it can be appropriately deleted.

10, 10a, 10b rotary electric machine, 20, 20b housing, 30 stator, 31 stator core, 33 first through hole, 34 end face, 40 rotor, 50, 50a, 50b fixing member, 60, 60a, 60b fixing plate, 66 second Through hole, 68 3rd through hole, 70 1st fastening member, 80 tubular member, 81 end face, 90 2nd fastening member, AD axial direction

Claims (6)

It is a rotary electric machine (10, 10a, 10b).
With the rotor (40),
A stator (30) having a cylindrical stator core (31) composed of a plurality of steel plates laminated along the axial direction (AD) and having a first through hole (33) formed along the axial direction.
A housing (20, 20b) for accommodating the rotor and the stator, and
Fixing members (50, 50a, 50b) for fixing the stator core to the housing, and
Equipped with
The fixing member is
A fixing plate (60, 60a, which is arranged in contact with the axial end surface (34) of the stator core and has a second through hole (66) and a third through hole (68) along the axial direction. 60b) and
A first fastening member (70), which is arranged so as to align the first through hole and the second through hole in the axial direction and fastens the stator core and the housing in the axial direction.
A tubular member (80) inserted into the third through hole and having its own end face (81) in the axial direction in contact with the housing.
A second fastening member (90) that is inserted into the third through hole via the tubular member and fastens the fixing plate and the housing in the axial direction.
Have,
The fixing plate is configured to be movable along the axial direction with respect to the cylindrical member.
Rotating machine. In the rotary electric machine according to claim 1,
The fixing member has at least one of the first fastening members, and two or more of the tubular members and the second fastening member.
Rotating machine. In the rotary electric machine according to claim 1 or 2.
It comprises at least three fixing members arranged side by side along the circumferential direction of the stator core so as to include the axis (AX) of the stator core.
Rotating machine. In the rotary electric machine according to any one of claims 1 to 3.
The fixing plate is
A plurality of fixing portions (63a) in which the second through hole and the third through hole are formed and arranged side by side along the circumferential direction of the stator core, and
Connecting portions (64a, 64b) that are connected to the plurality of fixed portions along the circumferential direction and connect the fixed portions adjacent to each other in the circumferential direction.
Has a rotary electric machine. In the rotary electric machine according to claim 4,
The connecting portion has an insulating portion (65b) having an electrical insulating property, and has an insulating portion (65b).
The insulating portion functions as a terminal block for electrically connecting the external lead wire (99) and the stator coil (38) wound around the stator core.
Rotating machine. In the rotary electric machine according to any one of claims 1 to 5.
The linear expansion coefficient of the tubular member is larger than the linear expansion coefficient of the fixed plate.
Rotating machine.

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